65845320861 has 12 divisors (see below), whose sum is σ = 89123691552. Its totient is φ = 43241694408.

The previous prime is 65845320841. The next prime is 65845320883. The reversal of 65845320861 is 16802354856.

It is a happy number.

It is not a de Polignac number, because 65845320861 - 2¹³ = 65845312669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65845320861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65845320841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2431225 + ... + 2458158.

It is an arithmetic number, because the mean of its divisors is an integer number (7426974296).

Almost surely, 2^65845320861 is an apocalyptic number.

It is an amenable number.

65845320861 is a deficient number, since it is larger than the sum of its proper divisors (23278370691).

65845320861 is an equidigital number, since it uses as much as digits as its factorization.

65845320861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4889520 (or 4889453 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 65845320861 in words is "sixty-five billion, eight hundred forty-five million, three hundred twenty thousand, eight hundred sixty-one".